Improved revolving pile-hook



? o". *N dammi d. D. LEACH AND SABIN HUTCHNGS, OF PENBSCOT, MANE. Letters .Patent No. 84.8816, dated December v15, 1868:

To all whom 'it may concern Be it known that we, J. D. Lenen and SABIN Huren- INGs, of Penobscot, in the county of Hancock, and State of Maine, have invented a new and useful Elastic Re# volvjng Pile-Hook; and we do hereby'declare that tlie following.is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Y Figure l is a'perspective view of our invention, attached to a wharf-pile, and

Figure 2 is a longitudinalvertical section ofthe sam e.

Figure 3 is a detached sectional view of the springs,

and the parts with which they are connected.

Similar letters of reference indicate corresponding parts in the several figures.

The nature of our invention consists in a metallic collar, formed to revolve loosely upon thel pile; Upon one side of this collar is formed a hollowprojection, in which are inserted springs, of rubber or other material. The shank of a stout hook passes through this projection and the springs, and'is secured upon the inside by a key or its equivalent, the whole so arranged that,

when a warp or hawser is attached to the hook, the spring prevents shocks upon the hawser, while, by the free revolving of the collar upon the pile, the strain is always directly in line from the pile to the vessel, and equal upon both parts of the eye-splice injthe warp.

Inthe drawings, A represents the cap-sill of the wharf, in which the pilevB is inserted, but the pile may be secured in any knownmanner.

C is the metallic collar or band which encloses the pile, and

D isa hollow projection upon the collar.

E is a wrought-iron hook, the shank 'of which is inserted in and passes through the projection, as shown in fig. 2. v l

e care circular rings or buffers, of rubber, inserted in projection D, and through whichthe shank of the hook passes. v

The inner end ofthe hook also passes through a circular metallic collar, a, and a key, b, passes through the shank, behind the collar.

F is the hawser, attached to the hook, and by which force is exerted upon it.

` The form of the springs c c is clearly shown in iig. 3, their section being a circle, with a thin projecting ange, both internal and external, the former bearing against the hook, and the latter against the inside of the cavity in which they are placed.

These projections keep the springs and the hook in thecentre ofthe cavity in which they are placed, and, as the elasticity of rubber is economiaed, not by compression, but byrdisplaee'ment, therefore this form of spring is peculiarly adapted for insertion in tubes, and similar uses. i

It will be apparent that attaching the hawser to the pile, through the intervention of the hook E and collar G, is much easier than the usual method of throwing the eye-splice over the head of the pile, while the elasticity imparted to the hook by the rubber buffers greatly lessens the shocks upon the hawser, and the 'easilyrevolving collar C tends' to preserve 'a steady strain, insteadofthe jerks caused by the hawser rendering fitfully upon the pile when the vessel changes position upon the hawser.

The lugs vd el serve to protect the pile from abrasion, and, by being formed with projecting ends, they hold it at the right height.

This hook is peculiarly adapted for wharves Where -steamers touch, and back and turn upon ybow or stern- -buiiers c c, substantially inI manner as and for the purposes specified.

J. D. LEACH. Witnesses: SABIN HUTGHINGS.

MILTON WARDWELL, HIRAM F. Limon. 

